Lamp-fixture.



Patented Nov. 1,1910.

1?. FORG.-

LAMP FIXTURE.

APPLICATION FILED NOV.14, 1907.

l M m a fiibauues.

PETER FORG, OF SOMERVILLE, MASSACHUSETTS.

LAMP-FIXTURE.

Specification of Letters Patent.

Patented Nov. 1, 1910.

Application flied November 14, 1907. Serial No. 402,085.

To all whom it may concern:

Be it known that I, PETER Form, a citizen of the United States, residingin Somerville, in the county of Middlesex and State of Massachusetts,have invented an Improvement in Lamp-Fixtures, of which the followingdescription, in connection with the accompanying drawings, is aspecification,

like letters on the drawings representing like parts.

This invention relates to a fixture or support especially adapted amongother uses to be employed in connection with incandescent electriclamps.

The invention has for its object to provide a simple and eflicient suport or fixture, which can be attached to t e ceiling or a wall of aroom, and which is constructed as will be described, so that the fixtureor suport can be moved in different directions to bring the lamp intoany position desired. These and other features of this invention will bepointed out in the claims at the end of this specification.

Figure 1 is an elevation of a fixture or support embodying thisinvention. Fig. 2,

an elevation of the fixture in a difi'ere'nt position from that shown inFi 1. Fig. 3, a sectional detail on an enlarge scale of the base plateand its cooperatin clam ing late to be referred to. Fig. 4, a detail 0the liinge joint for the lamp holder, and Figs. 5

' and 6, detailsto be referred to.

Referring to the drawings a represents a hollow base, which may be ofcast metal and is adapted to be fastened to a ceiling or wall of a roomby screws I) passed through holes'c in a flange g of said base.

The hollow base a is provided with a conical body portion and a bottomwall it having a substantially central opening formed by a substantiallyconical flange z extended from the bottom wall 71. into the hollow base.The opening formed by the conical annular flange i constitutes a socketinto which is fitted the upper portion of a ball m of metal,

which is retained in its socket by a clamping plate or disk n, providedwith a substantially central opening formed by a conical flange o,whichextends in the opposite direction to the flange z and serves toholdthe ball in its socket, the openings formed by the flanges i and o,bein of smaller diameter than the hall, where y the latter is preventedfrom assing through the bottom wall 7:. of the ase or through theclamping plate or disk 11., the latter bein secured to the bottom wallit of the holFow base by screws p, which engage threaded holes in thesaid bottom wall. By tightening up or looseninfi the screws p, theconical flange a on t e clampin plate or disk is caused to embrace thebal nearer to or farther away from its center and thereby increase ordiminish the friction between said flan e and ball and thus regulatemovement of the ball in the base 'plate.

The ball m has firmly secured to it the upper end of a rod 10, which maybe hollow and which forms one member of an extensible support for theholder or socket piece 12 of the incandescent lamp, the other member ofwhich is shown as a rod 13, preferably hollow, which is adj ustablyconnected with the rod or member 10 by a frictional clamping device aswill be described. The frictional clamp consists of two members, one oneach rod, one of the said members comprising a back plate or bar 14having arms 15, 16, extended from the end of the bar or platesubstantially at right angles thereto, and provided with holes (notshown), through which the rod 10 is passed. The other member is of likeconstruction and comprises a back plate or bar 18 and arms 19, 20 havingholes through which the rod 13 is passed. The back plates or bars 14, 18are frictionally secured together by a rivet 21 extended throughconcaved metal washers 22, 23, which press the back plates of the twomembers together with suflicient force to create a friction which willhold the two members in any position into which they are turned, therebyenabling the member 13 and the lamp socket 12 carried by it, to beturned into various angular positions with relation to the rod or member10. In Fig. 2, the member 13 is shown as turned into a position which isinclined with relation to the member 10. Provision is also made foradjusting the members of the clamping device on the rods 10, 13, and for'frictionally holding said members in their adjusted position. Thisresult may be accomplished as herein shown by curved sheet metal springplates 25, which are located between the rods 10, 13, and the backplates 14, 18, respectively said spring plates having longitudinallyextended depressions 26 (see Figs. 5 and 6), whose walls engage the rods10, 13 to prevent lateral movement of said springs. rovision is alsomade for positivcly securing one member to the rod 10 in any desiredposition, and this result may be accomplished by a, thumb-screw 30passed through a.threaded hole in the back 31 of a saddle or yoke havingears 32, 33, which straddle the arm and through which the rod 10 ispassed, so that, by turning the thumb-screw 30 against the arm 15, thesaddle is moved awa from the arm 15 and the rod 10 is clampe or gri pedby the lugs 32, 33 and the said arm. rovision is also 'made foradjustably securmg the socket piece 12 of the lamp to the member 13 andthis result may be accomplished by a friction hinge as will bedescribed. The friction hinge referred to, may be made as herein shownand consists of a collar secured on the lower end of the rod or member13 as by the set screw 41', and provided with arms 42, 43, which areheld in frictional engagement with like arms 44, 45 on a collar 46,which is secured as by a screw 47 on the socket piece or holder 12 forthemcandescent electric lamp. The arms 42, 43, 44, 45 are held infrictional engagement by means of spring washers 50, 51, and rivets 52,53 extended through them (see Fig. 4).

The socket piece 12 may have clamped on it a metal reflector 55 to whichis detachably secured a wire guard 56 for the bulb of the lamp. Y

Ino eration with the fixtureherein shown, the ho lowbase a is fastenedto the ceiling or it may be the wall of a room, and in the presentinstance, it is represented as fastened to the ceiling; The frictionalengagement of the ball m with the walls of its socket may be regulatedby adjusting the screws p so as to bring the clamping disk or plate nnearer to or farther away from the base a, and thereby cause the flange0 to engage the ball m nearer to or farther away from its center. Theclamping disk or plate is adjusted so as to create suflicient frictionto hold the ball m and the rod or member 10 in the position in which itis turned. The friction clamp engaging the members or rods 10, 13,permits the rod or member 13 to be turned into a position at an angle tothe member or rod 10 as represented in Fig. 2, and the friction hingebetween the lamp holder and the member 13, enables the said holder to beturned into a position at an an gle to the member or rod. Further therod 13 may be moved lengthwise or rotated and held in its adjustedposition by the spring 25. It will thus be seen that the adjustablefixture or support is capable of being turned or adjusted so as to bringthe incandescent I lamp carried by its holder or sockct.,1 )iece intoany desired )osit-ion, which is especially desirable in mills, factoriesand machine shops, and other places. So also, it will be observedthatthe friction device 25 enables the rods 13 to be moved lon itudinallyand to be automatically held in tli which it is moved. So also themember of the friction clamp may be moved on the rod 10 andautomatically held by the curved spring 25 or positively held by thesaddle 31. The rods 10, 13 may be solid or as may be referred they maybe made hollow and the amp cord or conducting wires 60 passed throughthem. I g Claims: 1. In an adjustable fixture or support, incombination, two rods or members, and a frictional clamp for connectingsaid members, said clamp comprising two back plates pivot-ed togetherand engaged by sprin washers, arms extended from said bac plates andprovided with holes through which said rods are passed, and springplates-engaging said rods between the said arms, substantially asdescribed. v v

2. In an ad'ustable fixture or support, in

combination, two rods or members, and a frictional clamp for connectingsaid members, said clamp comprising two back plates pivoted to ether andenga ed by spring Washers, arihs extended from said back plates andprovided with holes through which said rods are passed, spring platesenga ing said rods between the said arms, a sad le straddling one ofsaid arms and provided with holes through which a rod passes, and a setscrew extended through the back of said saddle and engagingthe armstraddled by said saddle, substantially as described.

3. In an adjustable fixture or support, in combination, two rods ormembers, and a frictional clamp for connecting said members, said clampcomprising two back plates pivoted together and engaged by springwashers, arms extended from said back plates and provided with holesthrough which said rods are passed, a spring plate carried by one ofsaid clamping members and engaging the rod passed through the arms ofsaid member and means to secure the other of said clamping members tothe rod extended through its arms, substantially as described. Intestimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

PETER FORG. Witnesses: 1

JAs. H. CHURCHILL, J .MUnPHY,

e position into

